pandoc 2.19 "flattens" text in table of contents, no more <span> — workaround?

["szho...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <szhorvat-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Dear Pandoc users,

I had a small Pandoc filter that extended each subheading with a link back 
to its parent heading. However, this changes the heading text (by adding 
the link text), which showed up in the table of contents. I did not want 
this, and since I use HTML output, I could use some CSS to hide the extra 
text. This was possible because the extra text was in a <span> element.

However, since pandoc 2.19, the extra text is just appended, without a 
<span>. Thus I cannot hide it the same way. Is there a workaround?

To give a concrete example, consider this simple markdown:

# My Title

## Chapter 1

Foo

## Chapter 2

Bar

This is a simplified version of my filter:

local function head_add_backlink (head) 
head.content:extend(
  {
    pandoc.Link(
     "▴",
     "#my-title",
     "",
     pandoc.Attr("", {'link-back'})
    )
   }
)
return head
end

return { 
  { Header = head_add_backlink }
}

I am running this with pandoc --toc --lua-filter=my_filter.lua -t html -s 
test.md 

With pandoc 2.18, the table of contents looked like this:

<li><a href="#chapter-1" id="toc-chapter-1">Chapter 1<span>▴</span></a></li>

With 2.9 it looks like this

<li><a href="#chapter-1" id="toc-chapter-1">Chapter 1▴</a></li>

Notice that there is no more <span> that I can use to hide the "▴" 
character.

Is there a simple way to achieve my goal with 2.19, i.e. have backlinks in 
each header yet not show these backlinks in the table of contents?

Thanks for any help in advance,
Szabolcs

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